diff --git a/allure-java-commons/src/test/java/io/qameta/allure/AllureLifecycleTest.java b/allure-java-commons/src/test/java/io/qameta/allure/AllureLifecycleTest.java
index 0a06dd32..bd2c079b 100644
--- a/allure-java-commons/src/test/java/io/qameta/allure/AllureLifecycleTest.java
+++ b/allure-java-commons/src/test/java/io/qameta/allure/AllureLifecycleTest.java
@@ -344,6 +344,10 @@ void shouldAttachAsync() {
                         tuple(attachment2Name, "text/plain")
                 );
 
+        assertThat(attachments)
+                .extracting(io.qameta.allure.model.Attachment::getSize)
+                .containsOnlyNulls();
+
         final String[] sources = attachments.stream()
                 .map(io.qameta.allure.model.Attachment::getSource)
                 .toArray(String[]::new);
diff --git a/allure-model/src/main/java/io/qameta/allure/model/Attachment.java b/allure-model/src/main/java/io/qameta/allure/model/Attachment.java
index dc5b36e7..ef938f24 100644
--- a/allure-model/src/main/java/io/qameta/allure/model/Attachment.java
+++ b/allure-model/src/main/java/io/qameta/allure/model/Attachment.java
@@ -32,6 +32,7 @@ public class Attachment implements Serializable {
     private String name;
     private String source;
     private String type;
+    private Long size;
 
     /**
      * Gets name.
@@ -93,4 +94,24 @@ public Attachment setType(final String value) {
         return this;
     }
 
+    /**
+     * Gets size.
+     *
+     * @return the size
+     */
+    public Long getSize() {
+        return size;
+    }
+
+    /**
+     * Sets size.
+     *
+     * @param value the value
+     * @return self for method chaining
+     */
+    public Attachment setSize(final Long value) {
+        this.size = value;
+        return this;
+    }
+
 }